Found the bowl contaminated with what appears to be white crystalline material that is not soluble in acetone or IPA. Scrapped most out with a dry wipe, then wiped with a water wet wipe, followed by acetone wipe and dry. I cannot imagine what this material might have been but it is somewhat similar in appearance to the ammonium fluoride crystals often found around the BOE tanks at WBNONMETAL. But surely no one would be spinning BOE in the laurel spinner. WTF?